Avoid redefining snprintf on Win32
Avoid redefining snprintf on Win32

Some Win32 platforms (ie Mingw64) provide the snprintf
function so only redefine it if it doesn't already exist.

Signed-off-by: Daniel P. Berrange <dan@berrange.com>


git-svn-id: 40dd595c6684d839db675001a64203a1457e7319@14995 67ed7778-7388-44ab-90cf-0a291f65f57c

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